-Expiration accepts valid ISO timestamps with `Z` or an explicit numeric UTC offset, such as `2026-03-16T14:30:00-07:00`. Seconds are optional; fractional seconds support up to six digits. Values preserve their supplied clock time and numeric offset without losing fractional precision; `Z` is stored as `-00:00`. For example, `2026-03-16T14:30:00-07:00` and `2026-03-16T21:30:00Z` represent the same deadline and compare equally. Epoch numbers and timezone-free dates are not accepted. The picker retains the stored offset; cells, clipboard values, and exports use that offset too. Picking a day without a time uses midnight in that offset. New picker values default to `-00:00`. Numeric offsets are fixed: editing a date does not automatically switch between summer and winter offsets. A table can have one Expiration column. An empty expiration leaves the row unexpired; on an update, omit the field to preserve it or set it to `null` to clear it. Expired rows are removed by periodic cleanup, subject to the table's delete lock.
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